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fannaruto09
2 năm trước
cho đường tròn tâm O. đường kính AB cố định. M là trung điểm của OB, CD vuông góc AB tại M. E di chuyển trên cung nhỏ AC. BE cắt CD tại H. Kéo dài AE cắt DC tại K. điểm N đối xứng với A qua M Đã chứng minh được BMEK nội tiếp AEM đồng dạng ABK Cần chúng minh tâm của đường tròn ngoại tiếp tam giác BHK luôn thuộc 1 đường thẳng cố định Mọi người giúp mình với!! Hình đã vẽ sẵn. Các chữ cái nhỏ không liên quan nhé..
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Exercise 4: Read and complete the sentence with no more than three words. A DIFFERENT HOBBY Danny has a very interesting hobby. He collects tropical fish! His bedroom is a large aquarium all around the wall. He has collected fish since he was four. His first fish was an Angle fish. The only problem is that it can eat smaller fish. Danny has visited a lot of different countries such as Australia to dive in the beautiful weather. He loves the ocean. Now he is fourteen. He has had a big aquarium for three years, since he was eleven. Last year, when Danny was in Caribbean for his holiday, he saw sharks when he was diving. He wants to have an aquarium where he can keep one or two small sharks, but it is quite difficult in England. Sometimes he goes to the local zoo to feed the big fish. He has never fed the sharks because he is too young. 1. There is ...........................around his bedroom wall. 3. His first fish is ........................... 4. An angle fish eats ........................... 5. Danny had ...........................when he was eleven. 6. Danny went to ........................... for his holiday. 7. Danny wants to keep one or two small ........................... 8. Danny has never fed the sharks because he is ...........................

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